如何使用 java 在数组中计算唯一元素?
Set 接口不允许重复元素,因此创建 set 对象并尝试将每个元素使用 add() 方法添加到其中,如果遇到重复的元素,此方法将返回 false −
如果你尝试将数组的所有元素添加到 Set 中,它只会接受唯一元素 −
示例
import java.util.Arrays;
import java.util.HashSet;
import java.util.Scanner;
import java.util.Set;
public class CountingUniqueElements {
public static void main(String args[]) {
Scanner sc = new Scanner(System.in);
System.out.println("Enter the size of the array that is to be created ::");
int size = sc.nextInt();
int count = 0;
int[] myArray = new int[size];
System.out.println("Enter the elements of the array ::");
for(int i = 0; i<size; i++) {
myArray[i] = sc.nextInt();
}
System.out.println("The array created is :: "+Arrays.toString(myArray));
System.out.println("indices of duplicate elements in the array are elements :: ");
Set set = new HashSet();
for(int i = 0; i<myArray.length; i++) {
if(set.add(myArray[i])) {
count++;
System.out.println("Index :: "+i+" Element :: "+myArray[i]);
}
}
}
}
输出
Enter the size of the array that is to be created :: 6 Enter the elements of the array :: 45 45 45 69 32 69 The array created is :: [45, 45, 45, 69, 32, 69] indices of duplicate elements in the array are elements :: Index :: 0 Element :: 45 Index :: 3 Element :: 69 Index :: 4 Element :: 32
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